Hello,

I don't really see the point of communicating "like a PRO" on this subject and of giving lessons (especially since you don't bring a new solution apart from your site ...).
In addition, vulgarity brings nothing either

If people from Charente-maritime read your exchanges, this technique does not exist only in Poland ....
In any case thank you to the Belgians, I didn't know the term "frigolite"

You bother for nothing
a DPE cannot be made room / room (or then not adjoining rooms with independent heating)
cetvisolation.com
They calculate it, plus it's free and there's a lot of tricks to save